<template>
  <div>
    <!--面包屑导航-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <el-alert
        title="注意: 只允许为第三级分类设置相关参数"
        type="warning"
        :closable="false"
        show-icon
      >
      </el-alert>

      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类: </span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cataList"
            :props="cateProps"
            @change="handleChanged"
            clearable>
          </el-cascader>
        </el-col>
      </el-row>

      <el-tabs v-model="activeName" @tab-click="handleClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数 </el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染展开行-->
                <el-tag v-for="(item, index) in scope.row.attr_vals"
                        :key="index" closable
                        @close="handleClose(index, scope.row)">
                  {{ item }}
                </el-tag>
                <!--输入文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                  <!--添加按钮-->
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name" ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑 </el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除 </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态参数" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button >
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染展开行-->
                <el-tag v-for="(item, index) in scope.row.attr_vals"
                        :key="index" closable
                        @close="handleClose(index, scope.row)">
                  {{ item }}
                </el-tag>
                <!--输入文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                  <!--添加按钮-->
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button >
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button  >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!--修改参数对话框-->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model = "editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      cataList: [],
      // 级联选择框的配置
      cateProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      // 级联选择框绑定的数组
      selectedCateKeys: [],
      // 被激活页签的名称
      activeName: "many",
      // 动态参数
      manyTableData: [],
      // 静态参数
      onlyTableData: [],
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 表单的验证规则
      addFormRules: {
        attr_name: [
          {require: true, message: '请输入参数名称', trigger: 'blur'}
        ]
      },
      editDialogVisible: false,
      editForm: {},
      editFormRules: {
        attr_name: [
          {require: true, message: '请输入参数名称', trigger: 'blur'}
        ]
      },
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const {data: res} = await this.$http.get("categories");
      // console.log(res.data);
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类信息失败");
      }
      this.cataList = res.data;
    },
    // 级联选择器发生改变的事件
    async handleChanged() {
      await this.getParamsData();
    },
    // tab点击事件
    handleClick() {
      console.log(this.activeName);
      this.getParamsData();
    },
    // 获取参数
    async getParamsData() {
      // 证明选中的不是三级分类,重置数组
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }
      // 根据所选id和面板获取对应的参数
      const {data: res} = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: {
            sel: this.activeName,
          },
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败");
      }
      // 先将 data中的attr_val用空格分割成数组，保存，便于后期在展开行循环出来
      res.data.forEach(item => {
        // 先判断attr_vals是否为空，不为空再切割，为空则直接返回空串
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
        // 控制文本框的显示与隐藏
        item.inputVisible = false;
        // 文本框输入的值
        item.inputValue = '';
      })
      console.log(res.data)
      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) {
          return
        }
        const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes/`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        console.log(res)
        if(res.meta.status !== 201) {
          return this.$message.error('添加商品参数失败');
        }
        this.$message.success('添加商品参数成功');
        this.addDialogVisible = false;
        await this.getParamsData();
      })
    },
    async showEditDialog(attr_id) {
      console.log(attr_id);
      const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
        {params: {attr_sel: this.activeName}})
      console.log(res);
      if(res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败')
      }
      this.editForm = res.data;
      console.log(this.editForm)
      this.editDialogVisible = true;
    },
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if(!valid) return;
        const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {attr_name: this.editForm.attr_name, attr_sel: this.activeName})
        if(res.meta.status !== 200) return this.$message.error('修改参数失败');
        this.$message.success('修改参数成功');
        await this.getParamsData();
        this.editDialogVisible = false;
      })
    },
    // 根据id删除元素
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err);
      // 用户取消了删除的操作
      if(confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if(res.meta.status !== 200) {
        return this.$message.error('删除参数失败');
      }
      this.$message.success('删除参数成功');
      await this.getParamsData();
    },
    // 文本框失去焦点或者按下enter触发的事件
    async handleInputConfirm(row) {
      // 判断用户是否输入空格
      if(row.inputValue.trim().length === 0) {
        row.inputValue = '';
        row.inputVisible = false;
        return
      }else {
        // 将输入的值放进去attr_vals中
        row.attr_vals.push(row.inputValue.trim());
        row.inputValue = '';
        row.inputVisible = false;
        // 发起网络请求将数据保存到数据库里面
        await this.saveAttrVals(row);
      }

    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      // 此处的row表示在视图区传下来的整行的信息,利用scoped.row传递下来，row进行接受
      row.inputVisible = true;
      // 文本框自动获得焦点
      // $nextTick: 当页面上的元素被重新渲染之后，才会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 删除操作保存到数据库
    async saveAttrVals(row) {
      const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
      if(res.meta.status !== 200) {
        return this.$message.error('修改参数失败')
      }
      this.$message.success('修改参数成功')
    },
    // 删除对应的参数和选项
    handleClose(index, row) {
      row.attr_vals.splice(index, 1);
      // 发送删除网络请求
      this.saveAttrVals(row);
    }
  },
  computed: {
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      } else {
        return false;
      }
    },
    // 当前选中的三级分类id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      } else {
        return null;
      }
    },
    // 动态计算标题
    titleText() {
      if(this.activeName === 'many') {
        return '动态参数'
      }else {
        return '静态属性'
      }
    }
  },
};
</script>

<style scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 0 10px;
}
.input-new-tag {
  width: 120px;
}
</style>